Physics – Condensed Matter – Superconductivity
Scientific paper
2007-04-06
Phys. Rev. Lett. 98, 197004 (2007)
Physics
Condensed Matter
Superconductivity
Accepted in PRL for publication
Scientific paper
10.1103/PhysRevLett.98.197004
We have investigated the doping dependence of the penetration depth vs. temperature in electron doped Pr$_{2-x}$Ce$_x$CuO$_{4-\delta}$ using a model which assumes the uniform coexistence of (mean-field) antiferromagnetism and superconductivity. Despite the presence of a $d_{x^2-y^2}$ pairing gap in the underlying spectrum, we find nodeless behavior of the low-$T$ penetration depth in underdoped case, in accord with experimental results. As doping increases, a linear-in-$T$ behavior of the penetration depth, characteristic of d-wave pairing, emerges as the lower magnetic band crosses the Fermi level and creates a nodal Fermi surface pocket.
Bansil Arun
Das Tanmoy
Markiewicz Robert S.
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